Structural, Petrologic, and Geochronologic Studies of the Pelona Schist and Related Rocks, Southern California

南加州中生代构造史有两种相互竞争的模式：一种是北美与外部大陆碎片之间的边缘盆地闭合模式，另一种是北美之下的正常大洋俯冲模式。Pelona- Orocopia-Rand-Portal脊片岩和Vincent-Chocolate Mountains-Orocopia- Rand逆冲断层是这一构造事件的产物。本研究将试图通过对加维兰山逆冲断层的仔细研究来解决这一问题，在加维兰山，明确的东北辐合形成了边缘盆地模型的主要论据。这项工作将测试东北运动是由于一个年轻的正常断层重新激活了原始逆冲的可能性。结果适用于美国西南部中生代构造的解析。

There are two competing models for the mesozoic tectonic history of southern California - closure of a marginal basin between North America and an outboard continental fragment and normal oceanic subduction under North America. The Pelona- Orocopia-Rand-Portal Ridge schists and the Vincent-Chocolate Mountains-Orocopia- Rand thrust faults are products of this tectonic episode. This study will attempt to resolve this issue by close examination of the thrust fault in the Gavilan Hills where the clear-cut northeast vergence forms the main argument for the marginal basin model. The work will test the possibility that the northeast motion is due to a younger normal fault which re-activated the original thrust. Results are applicable to the resolution of Mesozoic tectonics in the southwestern United States.